package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static  final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse)servletResponse;
        //1.获取本次请求的URL
        String requestURL=request.getRequestURI();
        log.info("拦截到请求：{}",requestURL);
       // 定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",    //因为前端已处理
                "/employee/logout",
                "/backend/**",
                "/common/**",
                "/front/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };
        //2.判断本次请求是否需要处理
        boolean check=check(urls,requestURL);
        //3.如果不需要处理，直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURL);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断登陆状态，如果一登陆，直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId=(Long) request.getSession().getAttribute("employee");

            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //        4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId= (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        //5.如果未登录状态返回未登录结果，通过输出流向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;





    }
    public boolean check(String[] urls,String requestURL){
        for(String url:urls){
            boolean match=PATH_MATCHER.match(url,requestURL);
            if(match){
                return true;
            }
        }
        return false;
    }
}
